forked from cerc-io/ipfs-ethdb
118 lines
3.4 KiB
Go
118 lines
3.4 KiB
Go
// VulcanizeDB
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// Copyright © 2020 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package pgipfsethdb
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import (
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"math/big"
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"github.com/ipfs/go-cid"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/jmoiron/sqlx"
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)
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var _ ethdb.Batch = &Batch{}
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// Batch is the type that satisfies the ethdb.Batch interface for PG-IPFS Ethereum data using a direct Postgres connection
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type Batch struct {
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db *sqlx.DB
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tx *sqlx.Tx
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valueSize int
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blockNumber *big.Int
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}
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// NewBatch returns a ethdb.Batch interface for PG-IPFS
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func NewBatch(db *sqlx.DB, tx *sqlx.Tx, blockNumber *big.Int) ethdb.Batch {
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b := &Batch{
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db: db,
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tx: tx,
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blockNumber: blockNumber,
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}
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if tx == nil {
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b.Reset()
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}
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return b
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}
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// Put satisfies the ethdb.Batch interface
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// Put inserts the given value into the key-value data store
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// Key is expected to be a fully formulated cid key
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// TODO: note, now that we expected a cid we could route to the "cids" tables based on prefix instead of to ipld.blocks
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// but is it better to handle this routing here, or use a completely different interface since we already have to refactor
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// at levels above this package in order to pass in cids instead of raw keccak256 hashes
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func (b *Batch) Put(cidBytes []byte, value []byte) (err error) {
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// cast and resolve strings from cid.Cast
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// this will assert that we have a correctly formatted CID
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// and will handle the different string encodings for v0 and v1 CIDs
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// (note that this v0 vs v1 is different from the blockstore v0 vs v1)
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c, err := cid.Cast(cidBytes)
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if err != nil {
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return err
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}
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if _, err = b.tx.Exec(putPgStr, c.String(), value, b.blockNumber.Uint64()); err != nil {
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return err
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}
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b.valueSize += len(value)
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return nil
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}
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// Delete satisfies the ethdb.Batch interface
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// Delete removes the key from the key-value data store
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func (b *Batch) Delete(cidBytes []byte) (err error) {
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c, err := cid.Cast(cidBytes)
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if err != nil {
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return err
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}
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_, err = b.tx.Exec(deletePgStr, c.String())
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return err
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}
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// ValueSize satisfies the ethdb.Batch interface
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// ValueSize retrieves the amount of data queued up for writing
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// The returned value is the total byte length of all data queued to write
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func (b *Batch) ValueSize() int {
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return b.valueSize
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}
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// Write satisfies the ethdb.Batch interface
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// Write flushes any accumulated data to disk
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func (b *Batch) Write() error {
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if b.tx == nil {
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return nil
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}
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return b.tx.Commit()
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}
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// Replay satisfies the ethdb.Batch interface
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// Replay replays the batch contents
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func (b *Batch) Replay(w ethdb.KeyValueWriter) error {
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return errNotSupported
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}
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// Reset satisfies the ethdb.Batch interface
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// Reset resets the batch for reuse
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// This should be called after every write
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func (b *Batch) Reset() {
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var err error
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b.tx, err = b.db.Beginx()
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if err != nil {
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panic(err)
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}
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b.valueSize = 0
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}
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